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arXiv 2007.15689physics.app-phcond-mat.mes-hall
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串联薄膜电池近场热光伏能量转换

Near-Field Thermophotovoltaic Energy Conversion with Thin-film Tandem Cells

Payam Sabbaghi, Qing Ni, Liping Wang

摘要:

对一种由p型掺杂GaSb和n型掺杂InAs薄膜子电池组成的串联电池结构的近场热光伏系统的性能进行了理论研究。Ga掺杂ZnO发射极和串联电池的温度分别为1800 K和300 K,GaSb和InAs子电池的厚度分别为1.5 μ m和0.5 μ m。随着多层并矢格林函数的波动电动力学被用来研究近场辐射传热与光子化学势的考虑,而辐射复合和非辐射俄歇复合考虑到评估的串联电池的电气性能。在50 nm的真空间隙下,发现具有独立电荷收集的串联电池在41%的转换效率下实现了468.8 kW/m2的电功率输出,产生了相对87%(或21%)的功率,比相同2 μ m厚度的单个GaSb(或InAs)电池高出约5%(或10%)的绝对效率。从能量传输系数的角度阐述了近场光谱传热的物理机制,并详细讨论了子电池的电流-电压特性。这项工作将铺平道路,以提高近场热光伏能量转换性能的串联或多结电池。

英文摘要:

The performance of a near-field thermophotovoltaic system with a tandem-cell structure composed of thin-film p-doped GaSb and n-doped InAs sub-cells on a gold backside reflector is theoretically investigated. The temperatures of the Ga-doped ZnO emitter and the tandem cells are set as 1800 K and 300 K, while the thicknesses of GaSb and InAs sub-cells are considered as 1.5um and 0.5um, respectively. Fluctuational electrodynamics along with the multilayer dyadic Green's function is used to study near-field radiative heat transfer with the consideration of photon chemical potential, whereas radiative recombination and nonradiative Auger recombination are taken into account for evaluating the electrical performance of the tandem cells. At a vacuum gap of 50 nm, it is found that the tandem cells with independent charge collections achieve electrical power output 468.8 kW/m2 at a conversion efficiency of 41%, generating relatively 87% (or 21%) more power with about absolute 5% (or 10%) higher efficiency than the single GaSb (or InAs) cell of the same 2-um thickness. The physical mechanism of near-field spectral heat transfer is elucidated with energy transmission coefficient, while the current-voltage characteristics of sub-cells are discussed in detail. This work will pave the way to enhance near-field thermophotovoltaic energy conversion performance with tandem or multi-junction cells.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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